// Copyright 2022 G42 Technologies Co.,Ltd.
//
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package region

type ProviderChain struct {
	serviceName string
	providers   []IRegionProvider
}

func NewProviderChain(serviceName string, providers []IRegionProvider) *ProviderChain {
	return &ProviderChain{
		serviceName: serviceName,
		providers:   providers,
	}
}

func DefaultProviderChain(serviceName string) *ProviderChain {
	providers := []IRegionProvider{NewEnvProvider(serviceName), NewProfileProvider(serviceName)}
	return NewProviderChain(serviceName, providers)
}

func (p *ProviderChain) GetRegion(regionId string) *Region {
	for _, provider := range p.providers {
		reg := provider.GetRegion(regionId)
		if reg != nil {
			return reg
		}
	}
	return nil
}
